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Keremiad<span> is a long literary work, usually in prose, but sometimes in verse, in which the author bitterly laments the state of society and its morals in a serious tone of sustained invective, and always contains a prophecy of society's imminent downfall. </span>
The group of Alkali metals describe the element in column 1 of the Modern Periodic Table.
Explanation:
Elements in the Periodic Table are arranged in the form of rows and columns. Elements in a row are in the increasing order of atomic number and have the same number of shells. Elements in a column have the same number of electrons in their valence shells. Elements in a column are arranged such that they have similar properties.
There are four distinct groups in the periodic table; alkali metals, alkaline earth metals, halogens and noble gases.
The first column of the Periodic table forms the alkali metals family which has the following order down the column; lithium(Li), sodium(Na), potassium(K), rubidium(Rb), cesium(Cs) and francium(Fr). They have similar properties. Alkali metals are soft and can easily be cut. They have very low densities. They also have low melting points.
Reactivity: Alkali metals are the most reactive metals because they only have one valence shell electron.
Keywords: Periodic table, alkali metals, alkaline earth metals, reactivity, elements
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Answer:
1.16 x 10⁻⁸N
Explanation:
Given parameters:
Mass of the two asteroids = 50000kg
Distance between the asteroids = 3800m
Unknown:
Gravitational force between the two asteroids = ?
Solution:
To solve this problem, we apply the newton's law of universal gravitation:
Fg =
G is the universal gravitation constant
r is the distance between them
So;
Fg = = 1.16 x 10⁻⁸N
1.) The statement is true!... heat energy is also generated due to the presence of resistance in motor. Heat generated is given by, H=i²Rt( i = current, R is the resistance of the conductor and t is time). 2.) This statement is false because transformation takes place in electrical motor too due to presence of resistance. 3.) c. <span> it is less than 100% efficient. </span>